The road is interrupted between km 2674 and 2696, due to the presence of Magellan Strait, which forces access between Santa Cruz and Tierra del Fuego Provinces through Chile, over Ruta CH-255 and Ruta CH-257 paved 57 kilometres (35 mi) north of the strait and another paved and treated 148 kilometres (92 mi) long south of it. The crossing of the Magellan Strait is done in 20 minutes through the use of a ferry traversing the width of 4.65 kilometres (2.89 mi) at that point.[1]

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These are the main (over 5,000 inhabitants) cities and towns joined by this route, North to South. In the provinces of Santa Cruz and Tierra del Fuego towns under 5,000 inhabitants are marked in italics.

In 1990 administration and maintenance of the most travelled roads was given to private companies with rights to collect tolls dividing the areas in "Corredores Viales" ("road corridors"). "Servicios de Mantenimiento de Carreteras" (Semacar) company, took charge of Corridor number 1, which includes Route 3 between km markers 19 and 677, in Buenos Aires Province, from the joining with Provincial Route 4 in San Justo to Bahía Blanca, with tolls collected in Cañuelas (km marker 78), Azul (km marker 263) and Tres Arroyos (km marker 523).,[3][4]

In 2003 the concession contracts expired, which lead to a modification of corridor numbers and a call for a new public bid. Corridor Vial number 1 is now given to "Empresa Rutas al Sur" and runs from km marker 62 to 677 which corresponds to the crossing of Provincial Route 6 in Cañuelas until it joins National Route 252 in Grünbein.[5]